I''m trying to build a form with an ordered list of elements. You can
add/remove an arbitrary number of items. I can use link_to_remote to
insert a new element, but I am having problems maintaining order when it
comes to submitting the form. Here is my "element":
<li id="<%= "choice_#{i}" %>">
<%= text_field_tag "choice_#{i}[text]", choice[0], :size =>
16, :id =>
"choice_#{i}_text" %>
<%= text_field_tag "choice_#{i}[value]", choice[1], :size =>
4, :id =>
"choice_#{i}_value" %>
<%= link_to_remote ''+'', :url => {:action =>
''insert_choice'', :id =>
"choice_#{i}" } %>
<%= link_to_function ''-'',
"Element.remove(''choice_#{i}'')" %>
</li>
It is actually a set of two text_fields, as you can see. When the form
is initially built with a default of 3 "choices," the order is given
by
choice_0, choice_1, etc. But when insert a new "choice" <li> via
ajax it
doesn''t have a proper name/id. I can call it "choice_new" or
something
but when the form is submitted the controller won''t know what order
they
were in the form.
Any suggestions?
-matthew
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Hmmmmmmmmm. You could create a hash and populate it with a mapping of position to choice_id. You will need to generate a unique ID for each added choice... I would try storing the mapping and the ''current ID'' in the session. Then, when you create a new choice: - Add one to the current ID in the session and use it for the choice ID. Save it to the session. - Get the hash from the session. Add the ID to it, pointing to the position. You will have to add one to all hash values greater than the position you want to insert to first. - Save the hash to the session. Deleting would be the same in reverse... Does that make sense? Ben --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Hmm, I never thought of storing the the choices in the session. So you would suggest redrawing the entire list each time a choice is added or deleted as opposed to trying to play it cheap and just insert/remote individual items? -matthew -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Matthew Isleb wrote:> I''m trying to build a form with an ordered list of elements. You can > add/remove an arbitrary number of items. I can use link_to_remote to > insert a new element, but I am having problems maintaining order when it > comes to submitting the form. Here is my "element": > > <li id="<%= "choice_#{i}" %>"> > <%= text_field_tag "choice_#{i}[text]", choice[0], :size => 16, :id => > "choice_#{i}_text" %> > <%= text_field_tag "choice_#{i}[value]", choice[1], :size => 4, :id => > "choice_#{i}_value" %> > <%= link_to_remote ''+'', :url => {:action => ''insert_choice'', :id => > "choice_#{i}" } %> > <%= link_to_function ''-'', "Element.remove(''choice_#{i}'')" %> > </li> > > It is actually a set of two text_fields, as you can see. When the form > is initially built with a default of 3 "choices," the order is given by > choice_0, choice_1, etc. But when insert a new "choice" <li> via ajax it > doesn''t have a proper name/id. I can call it "choice_new" or something > but when the form is submitted the controller won''t know what order they > were in the form.I''d recommend changing to <% @choices = Array.new(3, Choice.new) if @choices.empty %> <ul> <% @choices.each do |choice| %> <li> <%= text_field_tag ''choice_text[]'', choice.text, :size => 16 %> <%= text_field_tag ''choice_value[]'', choice.value, :size => 4 %> <%= link_to_function ''+'', ''var c=this.parentNode;c.parentNode.insertBefore(c.cloneNode(true),c)'' %> <%= link_to_function ''-'', ''var c=this.parentNode;c.parentNode.removeChild(c)'' %> </li> <% end %> </ul> Now there''s no numbering or ids to maintain, the texts and values are each posted as arrays, respecting their order in the document, the client-side insertion and deletion of choices is much more responsive for the user, and you no longer need to include Prototype. However for efficiency in actual implementation the scripts should be made page-wide functions that are called from each link. -- We develop, watch us RoR, in numbers too big to ignore. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
Excellent. I wasn''t aware that I could use name[] as a field name. Solves all my problems. Well, now I am not sure that I really want to "clone" the node. I may have to put some extra JS in there to clear the text_field values on the new node. -matthew -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---